Electric heating apparatus.



G. TEUBER.

ELECTRIC HEATING APPARATUS.

nrmcnzox FILED. snrr. 4, 1901.

917,504, New Apr. 6, 1909.

- A A have {Li 1 zczshdjglli l /WM 605M jffarrazy GUSTAV TEUEBER, OFLAASPHE, GERMANY.

ELECTRIC HEATING- APPARATUS,

Specification of Letters Patent.

Patented April 6, 1909.

Application filed September 4, 1907. Serial No. 391,363.

To all whom it may concern:

Be it known that I, GUSTAV TEUBER, a subject of the King of Prussia,German Empire, and resident russia, Germany, have invented certain newand useful Improvements in Electric Heating Apparatus, of which thefollowing is an exact specification.

This invention relates to electric heating apparatus and more especiallyto the heating p ates used in such ap aratus and provided with spirallyshaped. electric heating resistances. Insuchheating lates thesiralshitherto have been separated orisolated from each other by mica orasbestos, but this kind of arrangement has proved to be unsatisfactorywith regard to the delivery of heat and utilization of electric energy.For removing these disadvantages the present invention is intended andit consists m a heating plate in which the electric heating resistancesare embedded in a fire-proof and isolating ceramic paste, and in theparticular arrangement and application of the diiierent parts to be usedin connection with such heating plates.

To make my invention clear, reference is had to the accom anyingdrawings, in which: Figure 1 is a p an, and Fig. 2 a cross section online AA of Fig. 1. Fig. 3 is a plan the covering as used in thisinvention being removed.

Referring to the figures a is a base plate which is made of ceramicpaste; this ceramic paste consists according to the invention of quartz,and further basic elements such as clay, white clay and suitable fluxestogether with water-glass may be added. The mineral, such as quartz, isulverized and intimately mixed with o ay, the flux and water-glass.Different fluxes may be used, but I prefer to use feldspar. The pasteproduced as described is cast in plate having spiral-shaped passages a.For molding this base plate a in the manner indicated, preferably a dishhaving a low brim is used and into this dish or mold the porcelain-pasteis brought. After this the ass plate is caused to dry in the 0 on airand not subjected to any heat. The eating spiral b of any convenient orpreferred materialis now laced into the spiral passages of the base plzite and afterward a porcelainpaste obtained as above mentioned ispoured over the base plate so as to form a covering a and also allowedto d in the open air. As soon as the paste is d the heating plate ofLaasphe, Kingdom of the form of a is placed between two heated plates,or otherwise exposed to heat, in order to be fritted, that is to say, noburning of the material takes place. When the material is perfectlysolid, the heating body is finished for use.

It may be observed that it is perfectlyimpossible for the spiral heatingresistance to change its place and due to its being entirely embedded inheat transmitting materials a good exchange of heat between the electricheat-resistance and the body to be heated can take place.

In the Fig. 3 the cover is removed and as seen therein, (2 e are twoterminals for connecting the heating spiral to the electric conductors,not further shown.

Having thus fully described the nature of my invention, what I desire tosecure by Letters Patent of the United States is 1. The art of makingheating plates for electric heating apparatus consisting in embedding abare spiral conductor inan upper and lower plate made of ceramic pastecomposed of pulverized quartz, white clay and Water glass together witha flux, drying said plate in the air and then fritting it, substantially as described.

2. The art of making heating plates for electric heating apparatus,consisting in forming a base plate having spiral passages of a ceramicpaste composed of pulverized quartz, white clay and water glass togetherwith a flux, drying the base plate in the open air, mounting heatingspirals in the said spiral passages, laying a ceramic paste composed asmentioned on the base plate so as to completely embed the heatingspiral, drying the paste in the open air and then fritting the completeheating plate thereby produced.

3. The art of making heating plates for electric heating apparatus,consisting in forming a base plate having spiral assages, of pulverizedquartz, white cla fel ar and water-glass, in placing the spiral eatingresistance into said spiral passages, applying the afore mentioned pasteon the base plate, in drying the late so formed first in the open airand then ritting it.

4. A heating plate for use in electric heating apparatus comprising abase plate of a ceramic paste consisting of quartz, white clay, feldsparand water lass, a heating resistance embedded in sai plate and a coverformed of the aforementioned ceramic paste.

5. A heating plate for use in electric heat- In witness whereof I havehereunto set my ing a paratus comprising a base plate having hand in thepresence of two Witnesses. .spira passages and formed of a mixture ofquartz, white clay, feldspar and Water-glass, a GUSTAV TEUBER' 5 spiralheating body placed in said passages, \Vitnesses:

and a cover formed of the aforementioned OTTO KNIG, ceramic paste. WM.WASHINGTON BRUNSWICK.

